Dynamics of the outer disk and halo of M31

Details Dynamics of the outer disk and halo of M31 Dynamics of the outer disk and halo of M31

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317...62n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 62-81.

Astronomy and Astrophysics

Astrophysics

22

Andromeda Galaxy, Galactic Structure, Halos, Planetary Nebulae, Radial Velocity, Stellar Motions, Disk Galaxies, Globular Clusters

Scientific paper

The authors present observations of 37 planetary nebulae projecting 15 - 30 kpc radius near the major axis on both the southwest and northeast sides of M31. They give velocities for 34 of the nebulae, separate them into disk and halo objects, and analyze them using four published models of M31's warped disk. The (assumed flat) rotation rate of the disk planetaries is about 218±12 km s-1, ≡12 km s-1 below the circular velocity. Simple models are used to infer a Z dispersion, which indicates that the planetaries form a disk of semithickness 1-3 kpc. The total disk population is probably 2700 or more. The rotation rate of the halo planetaries is 92±43 km s-1, in good agreement with the globular cluster system. The total spheroidal planetary nebula population is about 6500±3500, 2-6 times the Milky Way value, and suggests that M31 has a more massive spheroid.

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